diff --git a/src/env_base.hpp b/src/env_base.hpp
index 6bf1957..b5bc0e9 100644
--- a/src/env_base.hpp
+++ b/src/env_base.hpp
@@ -48,6 +48,8 @@ namespace duck {
 		typedef std::ptrdiff_t difference_type;
 
 		EnvBase() = default;
+		EnvBase (const EnvBase&) = delete;
+		EnvBase (EnvBase&&) = delete;
 		virtual ~EnvBase() noexcept = default;
 
 		std::string_view operator[] (std::string_view name) const noexcept;